Improvement in grinding-machines



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GRINDING-MACHINE. No. 182,151. Patented, Sept. 12; 1876.

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GRINDING MACHINE.

No.182,151. Fatented Sept. 12, 1.876.

IIII/ N. PETERS. PHOTQLmIOGRAPHER, WASHINGTON, 0 (2V UNITED STATES PATENT; OFFICE.

JOE BERRY, or MANCHESTER, GREAT BRITAIN, AND JAsoN GILES, or HYDE PARK, MASSACHUSETTS.

LIMPROVEMENT IN GRINDING-MACHINES.

Specification forming part of Letters Patent No. 182,151, dated September 12, 1876; application filed December27, 1873.

' skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification.

Our invention relates to improvements in grinding-machines for the purpose of dressing and grinding plane surfaces; and consists in the employment of a rotary grinding-wheel,

secured to a shaft, to which is given a lateral motion by means of cams in one or both ends of said shaft, by which arrangement the grinder will always wear itself to a true circle as well as evenly across its face. The article to be ground is secured to a vertically-adj ustable plate or rest that is also moved horizontally by means of a crank-wheel and rack.

On the drawing, Figure 1 represents a side elevation of our invention. Fig. 2 represents a ground plan. Fig. 3 represents an end view, and Fig. 4 represents a longitudinal section, of one end of the grinder-shaft.

Similar letters refer to similar parts wherever they occur on the different parts of the drawings.

or represents the supports forthe bed-plate b. To the stationary plate b is secured the standards 0 0, provided with guides, on which the frame (1 is made to move up and down. The frame d may be operated by means of the hand-wheel e and screw f, in the ordinary way. When the frame at is placed in any de sired position, it may, furthermore, be secured to the standards cc by means of holding-bolts g g, or similar arrangement. To the frame (1 are secured two bearings, h h, for the grindershaft i to revolve in. To the shaft i is secured a circular grinding-wheel, k, that is set in rotary motion by means of power applied to the belt-pulley l, or in any other suitable manner. Besides the rotary motion of the grindingwheel is, we also give to it a lateral motion by means of the rotary eccentric cams m m secured tothe shafts n a. The shafts n a are movable in bearings c 0 0 0, that are secured .to the frame 01. To each of the cam-shafts n n is secured a bevel-gear, p 10', that engage with similar gears q q secured to the cross- -shaft 7'. The shaft r is set in rotary motion by means of power applied to a belt-pulley, S, or in any similar way. The shaft 1' is movable in bearings t t, that are secured to the frame 01, so that the shafts n n r, with their gears, cams, and pulley, follow the motion of the frame 01 as it is raised and lowered. We do not, however, confine ourselves to this peculiar arrangement for operating the cams m m, nor to the exact shape and form of the cams m m, as shown in the drawings, as we may substitute any similar arrangement and any kind of cams, whether grooved or plain, as may be desirable.

To prevent undue play between the ends of the shaft 11 and the cams m m, we construct one or both ends of the shaft tin a manner as shown in Fig. 4. For this reason we perforate the end of the shaft as shown in said figure, and place in the said hollow shaft a spiral or other spring, u, that presses against an intermediate piece, 12, interposed between the cam m and the said spring a. The cylindrical piece 12 is guided in the tubular recess in the end of the shaft i, as shown in Fig. 4.

The bed-plate b is provided with suitable parallel guides or ways 10 w, on which the carriage a; is made to move in a manner common on planing-machines, and may be operated by means of a crank, 31, pinion z, and a toothed rack on the under side of the carriage w, or by means of other well-known devices.

A plate or rest, A, to which the article that is to be ground is to be secured, is made adjustable up and down in a sleeve or bearing in the carriage a0, and is for this purpose operated by means of a screw-shaft, B, and its hand-Wheel G, or in a similar way.

Our improved grinding-machine is operated in the following manner: The piece that is to be ground is secured in a suitable way to the adjustable plate A, and the grinder kis set in a rotary motion around its axis, as wellas in a lateral motion, by means of the shafts n at, their connections to thepull ey S, and the cams m m, as hereinabove set forth. The carriage at, with the plate A, is moved forward and back under the revolving and laterally moving grinder k till the whole surface of the piece operated upon has been reached by the grinder. If still more is to be ground off the said piece the plate A is raised up the required distance by means of the hand-wheel O and screw-shaft B. As the grinder 7c wears off, the frame 01 can be moved downward a corresponding distance by means of the hand- Wheel 0 and screw f. The advantages obtained with our machine are, that we are able to grind and produce a true and even surface of the piece we operate upon, and the grinder It will wear itself to a true circle, no matter how ovalwhen first secured to the grindershaft i.

We do not confine ourselves to any particular kind of a grinder, as the same may be made of emery, or any otherWell-known material, as may be required for different kinds of work.

Having thus fully described the nature, condescribed.

struction, and operation of our invention, we

7 wheel 0, and the horizontally-adjustable carriage :0, all arranged and constructed in a man ner and for the purpose as herein shown and 2. In combination with the grinder kand its shaft 2', the shafts a n. r, pinions p p q q, and the cams m m, as and for the purpose set forth.

3. In combination with the shaft 13 and cams m m, one or both ends of said shaft 11 bored out for the reception of the spring a and cylinder v, for the purpose as herein fully set forth and described. v

In testimony that we claim the foregoing we hFWG hereunto set our hands this 10th day;

of November, 1873.

JOE BERRY.

Witnesses: JASON GILES.

ALBAN ANDREN,

W. F. BaowN. 

